import copy

a = [1,2,3,[4,5,6,[7,8,9]]]
#浅拷贝
b = a.copy()
# b = copy.copy(a)

#浅拷贝
c = copy.deepcopy(a)
print(a)
print(b)
print(c)

print("------------------")
b[3][3][0] = 100

print(a)
print(b)
print(c)